翼型近尾迹流中大尺度涡结构的理论模型

Theoretical Model of the Large-Scale Eddy Structures in the Near Wake Region Behind an Airfoil

根据流动稳定性理论相干结构的相关理论 ,提出了一种二维波模型来描述翼型近尾迹流动中的大尺度涡结构 ,通过采用对近尾迹流动区域分区处理的方法计算了近尾迹区域的大尺度涡结构。计算所得的流线图 ,涡量分布以及雷诺应力分布具有与实验结果相似的分布规律。

Based on the theory of flow instability and coherent structure, a new theoretical 2-D wave model of the large eddy structures in the near wake region behind an airfoil was proposed. By calculation, we obtained the streamlines and the vorticity contours. They were in good agreement with those of experimental observations. Also the theoretical results of Reynolds Stress variation show good agreement with experimental results. It can be concluded that this model can depict the physical mechanism of the large-scale eddy structures in the near wake region.